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Make sure you are even getting power through your a.c. switch on the console. That sends power to the main relay and through the high pressure and Low pressure switch in series and then to your compressor clutch. Trace power through all of these and you will know which component is faulty.
The low pressure switch would be around the air dyer system.
If line drier is cool on one side and warm on other you have a line restriction. Is compressor cycling on and off.?.. be careful jumping low pressure switch...The high pressure on low side is restriction going to evaporator coil in firewall... check for a filter in cab for evaporator coil it may be stopped up
Most likely your system just needs to be charged with r134a coolant. You can do it yourself. Just head down to the local auto parts store and buy a can of coolant that comes with a hose and gauge attached and then locate you low pressure port on you system. It is typically located on the passenger side between the radiator and the firewall on a silver tube. Don't worry you can't make a mistake as the coupler will only fit the low pressure side. When you locate it remove the cap and hook up gauge and can. Start the car and turn the AC to mac cold and highest fan speed. Then open the gauge depending on ambient temperature out side your gauge should read between 35-45 psi. The gauge should also be color coordinated as long as you don't fill until the gauge is in the red. Your good. Then close the gauge, remove it from the low pressure port and replace the cap on the port. (When the coolant is flowing into your system the can should turn quite cold and maybe even have some frost on it. No worries that is normal).
The re-fill kit for the r-134 will only fit on one of the sides. You want to fill the low pressure side, but be sure you have a gauge not to overfill. he high pressure will be the larger side. But the gauge will only fit on one of the inlets for safety precautions.
If you have checked all the fuses and relays and everything is ok, then start the truck and turn on the a/c from inside cab as you normally would do. Then go out side on passenger side of thuck and you will see a pressure switch mounted on the accumulator, disconnect the plug from the switch. Then insert a jumper wire into the plug, if clutch comes on then you do not hav enough freon or the switch is bad. Inspect for any leak on the system. Hope this will help you.
that is a low refrigerant sign you need to charge the system.. the compressor shuts off because the low preasure shutdown switch is triggerd when the compressor starts to move the refrigerant to the high side and shuts off thats why the preasure drops when the compressor clutch engages...
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